APA (7th ed.) Citation

Walter, H. (1967). The pampa problem and its solution. [publisher not identified].

Chicago Style (17th ed.) Citation

Walter, Heinrich. The Pampa Problem and Its Solution. Delft: [publisher not identified], 1967.

MLA (9th ed.) Citation

Walter, Heinrich. The Pampa Problem and Its Solution. [publisher not identified], 1967.

Warning: These citations may not always be 100% accurate.